﻿/// -----------------------------------------------------------------
/// RelationsManipulator.cs: This static class provides methods for extracting, 
/// updating and deleting Segment Relations in the Database.
/// License: see http://mve.codeplex.com/license; All Rights follows the MS-PL
/// Current owner: shiniwa
/// The project decription: please refer to http://codeplex.com/mve/
/// -----------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Xml;

namespace MVEContentSvc.RelationsOperations
{
    /*
     * 日本SGI株式会社
     * ヨハンソン・ヘンリク
     * johansson@sgi.co.jp
     * 
     * Change Log:
     * ---------------------------------------------------------------------------
     * 2009.01.07	Johansson Henrik		Class Created.
     * 2009.01.09							Updated GetRelationsBySegmentId, GetAllRelatedSegments
     *										to always return an XML string.
     *										Currently the application expect the reply to be an empty
     *										Xml Document even if an exception is thrown or no matching 
     *										data was founds.
     */

    /// <summary>
    /// This static class provides methods for extracting, 
    /// updating and deleting Segment Relations in the Database.
    /// Use the static methods in this class to perform  
    /// Segment Relations related operations on the Database.
    /// </summary>
    /// <remarks>INSERT:Creds</remarks>
    internal static class RelationsManipulator
    {
        /// <summary>
        /// Get all segment relations that contain the given segment id.
        /// Original Name = GetRelations
        /// </summary>
        /// <remarks>Done</remarks>
        /// <param name="segmentId">Id to search for</param>
        /// <param name="connection">Sql Connection</param>
        /// <returns>The Xml string that contains the response document.</returns>
        internal static string GetRelationsBySegmentId(int segmentId, SqlConnection connection)
        {
            SqlCommand command = new SqlCommand();
            SqlDataReader reader = null;
            command.CommandTimeout = 60;

            XmlDocument doc = null;
            XmlElement dataRoot = XmlConstructor.FormatResponseDocument(ref doc);
            XmlElement dataNodeRoot = doc.CreateElement("segment_relations");
            dataRoot.AppendChild(dataNodeRoot);

            string result = string.Empty;
            try
            {
                command.Connection = connection;
                command.CommandType = System.Data.CommandType.StoredProcedure;
                command.CommandText = "GetRelationsBySegmentId";

                command.Parameters.Add("segmentId", SqlDbType.Int).Value = segmentId;

                reader = command.ExecuteReader();

                if (reader.HasRows)
                {
                    if (doc != null)
                    {
                        while (reader.Read())
                        {
                            XmlElement relationTop = doc.CreateElement("segment_relation");
                            dataNodeRoot.AppendChild(relationTop);

                            int id1 = reader.GetInt32(0);
                            int id2 = reader.GetInt32(1);
                            int relation = reader.GetByte(2);

                            XmlElement id1E = doc.CreateElement("id1");
                            id1E.InnerText = id1.ToString();
                            relationTop.AppendChild(id1E);

                            XmlElement id2E = doc.CreateElement("id2");
                            id2E.InnerText = id2.ToString();
                            relationTop.AppendChild(id2E);

                            XmlElement relationE = doc.CreateElement("relation");
                            relationE.InnerText = relation.ToString();
                            relationTop.AppendChild(relationE);
                        }
                    }
                }

                result = doc.OuterXml;
            }
            catch (SqlException ex)
            {
                ErrorHandler.LogMessage(ex.Message, false);
                result = doc.OuterXml;
            }
            catch (InvalidOperationException ex)
            {
                ErrorHandler.LogMessage(ex.Message, false);
                result = doc.OuterXml;
            }
            catch (IndexOutOfRangeException ex)
            {
                ErrorHandler.LogMessage(ex.Message, false);
                result = doc.OuterXml;
            }
            finally
            {
                command.Dispose();
                if (reader != null)
                {
                    reader.Close();
                    reader.Dispose();
                }
            }

            return result;
        }//end:GetRelationsBySegmentId

        /// <summary>
        /// Get all related Segment given a Segment Id.
        /// Original Name = RelatedSegments
        /// </summary>
        /// <remarks>Done</remarks>
        /// <param name="segmentId">Id to search for</param>
        /// <param name="connection">Sql Connection</param>
        /// <returns>The Xml string that contains the response document.</returns>
        internal static string GetAllRelatedSegments(int segmentId, SqlConnection connection)
        {
            List<ClipOperations.Segment> _relatedSegments =
                new List<ClipOperations.Segment>();

            List<int> _segmentIdsToLoad =
                new List<int>();

            //Build The final result document
            XmlDocument doc = null;
            XmlElement dataRoot = XmlConstructor.FormatResponseDocument(ref doc);
            XmlElement resRoot = doc.CreateElement("segments");
            dataRoot.AppendChild(resRoot);

            string result = string.Empty;
            try
            {
                _segmentIdsToLoad =
                    RelationLoader.FindRelatedSegmentIdsInDatabase(segmentId, connection);

                //Get each matching segment from the database.
                foreach (int relId in _segmentIdsToLoad)
                {
                    ClipOperations.Segment segment =
                        ClipOperations.SegmentLoader.LoadSegmentFromDatabase(relId, connection);

                    if (segment != null)
                        _relatedSegments.Add(segment);
                }

                foreach (ClipOperations.Segment segment in _relatedSegments)
                {
                    ClipOperations.Clip clip =
                        ClipOperations.ClipLoader.LoadClipFromDatabase(segment.ParentClipId, connection);

                    if (clip != null)
                    {
                        XmlElement clipRoot = XmlConstructor.AddClipNodeToDocument(doc, clip, resRoot);
                        XmlElement segmentRoot = XmlConstructor.AddSegmentNodeToClip(doc, segment, clip.OnAirDate, clipRoot);

                        XmlElement kwRoot = doc.CreateElement("keywords");
                        segmentRoot.AppendChild(kwRoot);

                        List<KeywordOperations.Keyword> segmentKeywords =
                            KeywordOperations.KeywordLoader.LoadKeywordsForSegmentFromDatabase(
                            segment.Id, connection);

                        if (segmentKeywords != null)
                        {
                            foreach (KeywordOperations.Keyword keyword in segmentKeywords)
                            {
                                XmlConstructor.AddKeywordNodeToSegment(
                                doc, keyword, kwRoot);
                            }
                        }
                    }
                }

                result = doc.OuterXml;

            }
            catch (Exception ex)
            {
                ErrorHandler.LogMessage(ex.Message, false);
                result = doc.OuterXml;
            }
            return result;
        }//end:GetAllRelatedSegments
    }
}
